LEMON Manuals: Even more car manuals for everyone
Home >> Jeep >> 2017 >> Wrangler Sahara, Automatic Trans >> Repair and Diagnosis >> External Pages >> Different car >> Section 33 (2.4L Engine (Service Information)) >> Engine Block >> Bearing(S), Crankshaft, Main >> Standard Procedure >> Main Bearing Replacement

Main Bearing Replacement

WARNING: This page is about a different car, the 2017 Jeep Cherokee. However, it is still accessible from the selected car via links, so may be relevant.
GC0098630Courtesy of CHRYSLER GROUP, LLC

The main bearings must be replaced one-at-a-time in order to properly support the crankshaft. The upper (2) and lower (1) main bearing shells are NOT interchangeable. All upper bearing shells (2) have oil grooves and holes. All lower bearing shells (1) are smooth. Crankshaft end play is controlled by a two piece thrust bearing (3) on the second main bearing journal. The upper and lower main bearings are "select fit" to achieve proper oil clearances. Refer to STANDARD PROCEDURE  .

  1. Remove the engine from the vehicle and separate the transmission and flexplate from the engine. Refer to REMOVAL  .
  2. Remove the spark plugs. Refer to SPARK PLUG, REMOVAL .
  3. Remove the rear crankshaft oil seal. Refer to REMOVAL  .
  4. Remove the oil pan, balance shaft/oil pump assembly and ladder frame. Refer to FRAME, LADDER, REMOVAL .
    GC0162220Courtesy of CHRYSLER GROUP, LLC
  5. Loosen the ten main bearing cap bolts.
  6. Remove the bearing beam bolts (1 - 6) and remove the bearing beam. Temporarily install main bearing cap bolts (M10 x 1.25 x 76.5) into the unsupported No. 2, 3 and 5 main bearing caps hand tight.
    CAUTION:

    DO NOT use a number stamp or a punch to mark main bearing caps, as damage to main bearings could occur.

    NOTE:

    Main bearing caps are not interchangeable and are marked to insure correct assembly.

  7. Mark the main bearing cap positions using a permanent ink marker or a scribe tool. Replace only one main bearing at a time while all other main bearing caps remain properly tightened.
    NOTE:

    Replace the main bearings in the following order; 3, 2, 4, 1, 5:

  8. Remove the two cap bolts and remove the main bearing cap.
  9. When removing the second bearing cap, also remove the thrust bearings.
  10. Slide the upper main bearing half out from between the crankshaft and the engine block.
  11. If required, select fit new main bearings to the engine block. Refer to STANDARD PROCEDURE  .
  12. Lubricate the upper main bearing half with clean engine oil and slide the bearing into position.
  13. When installing thrust bearings at the second main bearing location, use the following procedure:
    NOTE:

    The thrust bearings must be installed with the notches facing the crankshaft.

    • Move the crankshaft forward to the limit of travel. Lubricate and install the front thrust bearing by rolling the bearing onto the machined shelf between the second upper main bulk head and crankshaft thrust surface.
    • Move the crankshaft rearward to the limit of travel. Lubricate and install the rear thrust bearing by rolling the bearing onto the machined shelf between the second upper main bulk head and crankshaft thrust surface.
    GC0104468Courtesy of CHRYSLER GROUP, LLC
    CAUTION:

    The main bearing cap bolts are tightened using a torque plus angle procedure. The bolts must be examined BEFORE reuse. If the threads are necked down the bolts must be replaced.

  14. Check the main bearing cap bolts for necking by holding a scale or straight edge against the threads. If all the threads do not contact the scale (2) the bolt must be replaced.
  15. Lubricate and install the lower bearing half onto the main cap.
  16. Install the main bearing cap with two inner main bearing cap bolts only hand tight at this time.
  17. Repeat the previous steps for main bearings 2, 4, 1 and 5.
    GC0169583Courtesy of CHRYSLER GROUP, LLC
  18. Remove the temporarily installed cap bolts from main bearing caps 2, 3 and 5. Install the bearing beam (1) with its longer bolts so that the <FRT indication (2) is pointing to the front of the engine.
    GC0162220Courtesy of CHRYSLER GROUP, LLC
  19. Tighten the ten main bearing cap bolts in the sequence shown in illustration, following this 3 step torque plus angle method. Tighten according to the following torque values:
    • Step 1: All to 15 N.m (11 ft. lbs.)
    • Step 2: All to 45 N.m (33 ft. lbs.)
    • Step 3: All an additional 45° Turn Do not use a torque wrench for this step. 
  20. Check the crankshaft end play. Refer to STANDARD PROCEDURE  .
  21. Install the ladder frame, balance shaft/oil pump assembly, engine timing cover, oil pan and cylinder head cover. Refer to FRAME, LADDER, INSTALLATION .
  22. Install the spark plugs and ignition coils. Refer to SPARK PLUG, INSTALLATION .
  23. Install a new rear crankshaft oil seal. Refer to INSTALLATION  .
  24. Install the exhaust manifold, flexplate and transmission to the engine and install the engine in the vehicle. Refer to INSTALLATION  .
  25. If removed, install the oil filter and fill the engine crankcase with the proper oil to the correct level. Refer to STANDARD PROCEDURE  .
  26. Fill the transmission to the proper level with the specified fluid. Refer to FLUID AND FILTER, STANDARD PROCEDURE .
  27. Fill the cooling system. Refer to STANDARD PROCEDURE .
  28. Connect the negative battery cable. If equipped with an Intelligent Battery Sensor (IBS), connect the IBS connector to the negative battery cable.
  29. Evacuate and charge the refrigerant system. Refer to PLUMBING, STANDARD PROCEDURE .
  30. Start engine and check for leaks.
  31. Run the engine until it reaches normal operating temperature. Check cooling system for correct fluid level. Refer to STANDARD PROCEDURE .
scientia non olet · About LEMON Manuals